On 30 March 2013 11:48, Attila Kinali <att...@kinali.ch> wrote: > Moin, > > I'm currently reading up some stuff on optical PLLs and am stuck with some > details i cannot find any data on. > > The goal is to make two lasers locked with about 7GHz of offset to eachother. > > So far, i figured out that PIN photodiodes can go up to several 100MHz > transition frequency and avalanche photodiodes are available up to 2GHz.
I would contact Hammamatsu Photonics http://www.hamamatsu.com and see if they can help. They might havae something in development, that is not on the web site. If you are in a uni, they might be especially helpful - they paid my salary for a couple of years as a post-doc. I played tricks during my Ph.D. of gain-modulating an APD with a step recovery diode. I was wondering if there is anything one could do to gain modulate one at 7 GHz, but I can't think how one could achieve anything useful by changing the gain, but it might be worth thinking about. I'm just trying to "think out of the box" - I can't actually see how it would help. Have you considered using a photomultiplier tube? I think there are some fast PMTs around, though perhaps not fast enough. 20 years I used to know what was state of the art in this area, but not any more. Dave _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.